Brother (2000)

When Yakuza gangster Yamamoto is forcibly retired from his clan after a hostile takeover, he flies from Tokyo to Los Angeles to find his younger half brother Ken. When he finds that Ken has dropped out of school to run a sloppy drug-dealing operation with his buddy Danny.Yamamoto transforms the ragtag gang into a styling posse of professional punishers and schools them in a kamikaze code of honor that puts all other forms of gang bonding to shame.